On Wed, Sep 19, 2007 at 09:07:52PM -0700, dane johansen wrote:

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> Hi,

>

> I'm trying CARP ip balancing on openbsd 4.2 (-current). I have 3 boxes (host

> A, host B and host C) so I started configuring carp interfaces according

> manual:

>

> A# ifconfig carp0 10.10.10.100 netmask 255.255.248.0 vhid 7 link0 link1

> A# ifconfig carp1 10.10.10.100 netmask 255.255.248.0 vhid 8 advskew 100

>

> B# ifconfig carp0 10.10.10.100 netmask 255.255.248.0 vhid 7 advskew 100

> link0 link1

> B# ifconfig carp1 10.10.10.100 netmask 255.255.248.0 vhid

>

> At this point everything works but there is no IP load balancing, because on

> host B both interfaces are in backup mode. So I've enabled carp preempt on

> both hosts:

>

> A# sysctl net.inet.carp.preempt=1

> B# sysctl net.inet.carp.preempt=1

>

> Now carp1 is master on host B, and it's doing load balancing, so i decided

> to add host C (maybe we need to add this to example section in the manual,

> like it's done for arp load balancing? Or is it just coincidence and you

> don't really need carp preemtp?):

Looks all correct. And yes, you do need to enable carp preempt.
> C# ifconfig carp0 10.10.10.100 netmask 255.255.248.0 vhid 7 advskew 200

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> link0 link1

Nothing wrong with that.

However, if you want to spread the load over 3 servers you'll need

3 carp interfaces each, where each server should be master for one

of them.
> As soon as I wrote this command I lost connection to host C (did that

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> remotely), so I guess tomorrow I'll have to check what happened, but maybe

> someone knows what did I do wrong (maybe advskew should equal for all backup

> hosts in the pool? but I assumed that you have to manage priorities that's

> why I've set it to 200, or maybe the fact that I've set carp.preempt is

> messing around something?)

Not supposed to happen.

Do you have more infos about what went wrong on host C ?
    Marco